随着超大规模集成电路向着高密度、高频方向发展,保证高速信号的可靠传输成为封装电学设计中的关键。完成了一款转换速率为2.5 GS/s的14 bit DAC陶瓷外壳封装设计,利用芯片、封装和PCB的协同设计,保证了关键差分信号路径在2.5 GHz以内...随着超大规模集成电路向着高密度、高频方向发展,保证高速信号的可靠传输成为封装电学设计中的关键。完成了一款转换速率为2.5 GS/s的14 bit DAC陶瓷外壳封装设计,利用芯片、封装和PCB的协同设计,保证了关键差分信号路径在2.5 GHz以内插入损耗始终大于-0.8 d B,满足了高速信号的传输要求;并结合系统为中心的协同设计和仿真,对从芯片bump到PCB的整个传输路径进行了仿真和优化,有效降低了信号的传输损耗和供电系统的电源地阻抗。展开更多
Scalar CSAMT is only suitable for measurements in one and two dimensions perpendicular to geological structures. For complex 3D geoelectric structure, tensor CSAMT is more suitable. In this paper, we discuss 3D tensor...Scalar CSAMT is only suitable for measurements in one and two dimensions perpendicular to geological structures. For complex 3D geoelectric structure, tensor CSAMT is more suitable. In this paper, we discuss 3D tensor CSAMT forward modeling using the vector finite-element method. To verify the feasibility of the algorithm, we calculate the electric field, magnetic field, and tensor impedance of the 3D CSAMT far-zone field in layered media and compare them with theoretical solutions. In addition, a three-dimensional anomaly in half-space is also simulated, and the response characteristics of the impedance tensor and the apparent resistivity and impedance phase are analyzed. The results suggest that the vector finite-element method produces high-precision electromagnetic field and impedance tensor data, satisfies the electric field discontinuity, and does not require divergence correction using the vector finite-element method.展开更多
In order to provide some reference for the design of the power/ground system, a complicated power/ground system in time and frequency domains was analyzed, which is based on PEEC (Partial Element Equivalent Circuit). ...In order to provide some reference for the design of the power/ground system, a complicated power/ground system in time and frequency domains was analyzed, which is based on PEEC (Partial Element Equivalent Circuit). According to the actual requirements, characteristics of some common power/ground structures in time and frequency domains, such as SSN (Simultaneous Switching Noise), are obtained for the future research. The results show the first resonance point is changed with the structure of the power/ground networks.展开更多
文摘随着超大规模集成电路向着高密度、高频方向发展,保证高速信号的可靠传输成为封装电学设计中的关键。完成了一款转换速率为2.5 GS/s的14 bit DAC陶瓷外壳封装设计,利用芯片、封装和PCB的协同设计,保证了关键差分信号路径在2.5 GHz以内插入损耗始终大于-0.8 d B,满足了高速信号的传输要求;并结合系统为中心的协同设计和仿真,对从芯片bump到PCB的整个传输路径进行了仿真和优化,有效降低了信号的传输损耗和供电系统的电源地阻抗。
基金supported by the National Natural Science Foundation of China(No.41104068)the Deep Exploration in China,Sino Probe-03-05
文摘Scalar CSAMT is only suitable for measurements in one and two dimensions perpendicular to geological structures. For complex 3D geoelectric structure, tensor CSAMT is more suitable. In this paper, we discuss 3D tensor CSAMT forward modeling using the vector finite-element method. To verify the feasibility of the algorithm, we calculate the electric field, magnetic field, and tensor impedance of the 3D CSAMT far-zone field in layered media and compare them with theoretical solutions. In addition, a three-dimensional anomaly in half-space is also simulated, and the response characteristics of the impedance tensor and the apparent resistivity and impedance phase are analyzed. The results suggest that the vector finite-element method produces high-precision electromagnetic field and impedance tensor data, satisfies the electric field discontinuity, and does not require divergence correction using the vector finite-element method.
基金National Natural Science Foundation ofChina(No.60 2 710 3 0 )
文摘In order to provide some reference for the design of the power/ground system, a complicated power/ground system in time and frequency domains was analyzed, which is based on PEEC (Partial Element Equivalent Circuit). According to the actual requirements, characteristics of some common power/ground structures in time and frequency domains, such as SSN (Simultaneous Switching Noise), are obtained for the future research. The results show the first resonance point is changed with the structure of the power/ground networks.
